A hermetic terminal is disclosed as having a body including an exterior surface and a plurality of openings in the body accommodating a pin extending through each opening that is hermetically sealed and electrically isolated from the body. The terminal also includes a dielectric pin-isolating feature forming a barrier that increases the operative through-air spacing between the pins of the terminal. The power rating for the terminal is thereby increased without increasing the overall size of the terminal.
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18. A hermetic terminal comprising:
a body including a wall having an exterior surface and a plurality of first openings therein;
a plurality of current conducting pins, one current-conducting pin extending through each first opening, the pins sealed within the first openings and electrically isolated from the body;
a dielectric barrier attached to the body, the barrier sized and shaped to closely fit a perimeter of the exterior surface of the wall, the barrier comprising a plurality of ribs, the ribs extending in a first direction generally parallel to a longitudinal axis of the pins and terminating in the first direction beyond the outer ends of the pins; and
wherein the barrier increases the operative through-air spacing between the pins.
32. A hermetic terminal comprising:
a body including a wall having an exterior surface and three openings therein;
three current conducting pins, one current-conducting in extending through each opening, the pins sealed within the openings and electrically isolated from the body;
a dielectric barrier attached to the body, the barrier comprising a plurality of ribs, the ribs extending in a first direction generally parallel to a longitudinal axis of the pins and terminating in the first direction beyond the outer ends of the pins;
wherein the barrier comprises three ribs extending from a central axis of the hermetic terminal toward a peripheral side wall of the of the body, the ribs being equally spaced apart at approximately 120 degree intervals; and
wherein the ribs separate adjacent current-conducting pins such that the ribs obstruct a direct, linear, through-air path between adjacent current-conducting pins.
1. A hermetic terminal comprising:
a cup-shaped metallic body member including a generally flat bottom wall and a peripheral side wall, the bottom wall having an exterior surface and a plurality of first openings therein;
a plurality of current-conducting pins, at least one current-conducting pin extending through each first opening;
a dielectric sealing material extending between and hermetically sealing the current-conducting pins within the first openings; and
a dielectric pin-isolating feature attached to the body member comprising a lower base portion and an upper barrier portion, the base portion being sized and shaped to closely fit the periphery of the exterior surface of the bottom wall, and the upper barrier portion comprising a plurality of generally vertically-upstanding, generally planar, non-parallel ribs extending from the base portion in a direction generally parallel to a central axis of the hermetic terminal and terminating beyond the outer ends of the current-conducting pins; and
wherein the pin-isolating feature increases the operative through-air spacing between the current-conducting pins.
17. A hermetic terminal comprising:
a cup-shaped metallic body member including a generally flat bottom wall and a peripheral side wall, the bottom wall having an exterior surface and three first openings therein;
three current-conducting pins, one current-conducting in extending through each first opening;
a dielectric sealing material extending between and hermetically sealing the current-conducting pins within the first openings; and
a dielectric pin-isolating feature attached to the body member comprising a lower base portion and an upper barrier portion, the base portion being sized and shaped to closely fit the periphery of the exterior surface of the bottom wall, and the upper barrier portion comprising a plurality of generally vertically-upstanding, generally planar ribs extending from the base portion in a direction generally parallel to a central axis of the hermetic terminal and terminating beyond the outer ends of the current-conducting pins;
wherein the pin-isolating feature comprises three ribs extending from the central axis of the hermetic terminal toward the peripheral side wall of the of the body member and being equally spaced apart at approximately 120 degree intervals; and
wherein the ribs separate adjacent current-conducting pins such that the ribs obstruct a direct, linear, through-air path between adjacent current-conducting pins.
2. The hermetic terminal of
3. The hermetic terminal of
4. The hermetic terminal of
wherein the plurality of current-conducting pins are correspondingly received in the plurality of second openings.
5. The hermetic terminal of
6. The hermetic terminal of
wherein the neck portions of the second openings are in close proximity fit with the respective current-conducting pins.
7. The hermetic terminal of
8. The hermetic terminal of
9. The hermetic terminal of
10. The hermetic terminal of
11. The hermetic terminal of
12. The hermetic terminal of
13. The hermetic terminal of
14. The hermetic terminal of
wherein a dielectric adhesive material is included between the underside surface and the exterior surface of the body member to attach the pin-isolating feature to the body member.
15. The hermetic terminal of
16. A hermetic terminal of
a cup-shaped metallic body member including a generally flat bottom wall and a peripheral side wall, the bottom wall having an exterior surface and a plurality of first openings therein;
a plurality of current-conducting pins, at least one current-conducting in extending through each first opening;
a dielectric sealing material extending between and hermetically sealing the current-conducting pins within the first openings; and
a dielectric pin-isolating feature attached to the body member comprising a lower base portion and an upper barrier portion, the base portion being sized and shaped to closely fit the periphery of the exterior surface of the bottom wall, and the upper barrier portion comprising a plurality of generally vertically-upstanding, generally planar ribs extending from the base portion in a direction generally parallel to a central axis of the hermetic terminal and terminating beyond the outer ends of the current-conducting pins;
wherein the ribs are generally rectangularly-shaped, having a length extending longitudinally from the base portion and terminating beyond outer ends of the current-conducting pins and a width extending laterally outwardly from the central axis of the hermetic terminal to approximately the peripheral side wall of the body member; and
wherein the pin-isolating feature increases the operative through-air spacing between the current-conducting pins.
19. The hermetic terminal of
20. The hermetic terminal of
21. The hermetic terminal of
22. The hermetic terminal of
23. The hermetic terminal of
wherein the ribs extend in a second direction generally perpendicular to the longitudinal axis of the pins and terminate in the second direction near the peripheral side wall.
24. The hermetic terminal of
25. The hermetic terminal of
26. The hermetic terminal of
wherein plurality of second openings respectively receive the plurality of current-conducting pins.
27. The hermetic terminal of
28. The hermetic terminal of
wherein the neck portions of the second openings are in close proximity fit with the respective current-conducting pins.
29. The hermetic terminal of
wherein the injection molding material forms one or more enlarged retaining heads at the upper surface adjacent to at least one of the second openings.
30. The hermetic terminal of
wherein the dielectric injection molding material occupies the passageway.
31. The hermetic terminal of
33. The hermetic terminal of
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The present disclosure relates to hermetic power terminal feed-throughs, and more particularly to hermetic power terminal feed-throughs employing dielectric over-surface protection for preventing electrical shorting of the terminal.
This section provides background information related to the present disclosure which is not necessarily prior art.
Conventional, hermetically-sealed, electric power terminal feed-throughs (also referred to as “hermetic terminals”) provide an airtight electrical terminal for use in conjunction with hermetically sealed devices, such as A/C compressors, where leakage into or from such devices, by way of the terminals, is effectively precluded. For hermetically-sealed electric power terminal feed-throughs to function safely and effectively for their intended purpose, the hermetic terminals require that their conductor pins be electrically isolated from, and hermetically sealed to, the body of the terminal through which they pass. In addition, an optimum through-air path between adjacent portions of the pins the opposite sides of the body, as well as between the pins themselves, must be established and thereafter maintained to minimize the possibility for generating an electrical short circuit at the terminal.
An exemplary hermetic terminal 1 and associated connector block 2 having constructions that are well-known in the art are shown in
A resilient electrical insulator is bonded to the outside surface of the body, as well as over the glass-to-metal seal and portions of the current-conducting pins. The insulator provides a dielectric over-surface covering for substantial portions of the outside surface of the terminal body and the conductor pins. In doing so, the insulator increases a path through the air between adjacent non-insulated portions of the conductor pins and the terminal body (though not between the pins in their entirety) and reduces the ability for contaminants, debris, and the like (e.g., metal shavings) to form unwanted current paths that could create an electrical short circuit at the terminal between the pin and the body.
Optionally, a connector block 2 like that shown in
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The disclosure provides a hermetic terminal having a body member with a generally flat bottom wall and at least a first opening in the wall. At least two electrically conductive pins, where at least one electrically-conductive pin extends through each of the first openings, are hermetically sealed within the first openings with a dielectric sealing material. Means for increasing the operative through-air spacing between adjacent ones of the electrically-conductive pins is also provided and enables a smaller diameter hermetic terminal to meet UL power requirement specifications for hermetic terminals for applications that would have previously required a larger diameter hermetic terminal. Consequently, a smaller diameter hermetic terminal can be used in higher voltage applications. Further, the pressure rating for a compressor using a smaller diameter hermetic terminal can be increased because of the smaller footprint of the terminal in the compressor which can withstand higher pressures and enabling the use of higher pressure refrigerants.
In another aspect of the disclosure, a hermetic terminal has a cup-shaped metallic body member including a generally flat bottom wall and a peripheral side wall. The bottom wall has an exterior surface and a plurality of first openings. A plurality of current-conducting pins extending through the first openings. A dielectric sealing material extending between and hermetically sealing the current-conducting pins is included within the first openings. A dielectric pin-isolating feature attached to the body member increases the operative through-air spacing between the current-conducting pins and includes a lower base portion and an upper barrier portion. The base portion is sized and shaped to closely fit the periphery of the exterior surface of the bottom wall. The upper barrier portion has a plurality of generally vertically-upstanding, generally planar ribs extending from the base portion, in a direction generally parallel to a central axis of the hermetic terminal. The ribs terminate beyond the outer ends of the current-conducting pins.
In still another aspect of the disclosure, a hermetic terminal has a body including a wall having an exterior surface and a plurality of first openings. A current-conducting pin extends through each first opening, and the pins are sealed within the openings and electrically isolated from the body. A dielectric barrier is attached to the body that is sized and shaped to closely fit the periphery of the exterior surface of the wall. The barrier includes a plurality of ribs that extend in a first direction generally parallel to a longitudinal axis of the pins and terminate in the first direction beyond the outer ends of the pins. The barrier increases the operative through-air spacing between the pins of the hermetic terminal.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
Conventionally, multi-pin hermetic terminals, such as those shown in
In multi-pin hermetic terminals, the conductor pins are centered and equally spaced about the terminal in a well-known manner. Referred to as a pin circle, a circle that passes through the center of each of the conductor pins has a diameter that is referred to as the pin circle diameter. Consequently, the power rating of a hermetic terminal is related to its pin circle diameter since an increase in the through-air pin-to-pin spacing of the hermetic terminal can be achieved by an increase in its pin circle diameter. An increase in the pin circle diameter, though, leads to a larger-sized hermetic terminal overall. Thus, a hermetic terminal rated for a lower voltage threshold will traditionally have a smaller overall diameter than a hermetic terminal rated for a higher voltage threshold.
In order to provide some standardization for the hermetic terminals used in air-conditioning and refrigeration compressor applications, two threshold power ratings for hermetic terminals have become established: the 300 volt-rating and the 600 volt-rating. Consequently, industry manufacturers have been able to standardize to two sizes (e.g., diameters) of hermetic terminals that meet the two voltage ratings for air-conditioning and refrigeration compressor applications. This means, for example, that there have to be two different sizes for the cut-out holes in the compressor shell into which the hermetic terminals are installed, and the machines that weld the hermetic terminals into the compressor shell have to be configured to accommodate two different sized hermetic terminals.
The invention of the present disclosure, however, enables a smaller diameter hermetic terminal to meet UL specifications while achieving a voltage rating for applications that would have previously required a larger diameter hermetic terminal. As a result, industry manufacturers can now standardize their designs and tooling to a single-sized hermetic terminal.
Moreover, since a smaller diameter hermetic terminal can be used, the pressure rating for the compressor can be increased. This is because hermetic terminals having a smaller footprint in the compressor can withstand higher pressures, allowing the compressor to have a higher pressure rating and use higher pressure refrigerants. For example, because the hermetic terminal can be manufactured to smaller overall dimensions than conventional terminals, the surface area of the terminal that is exposed to the high pressure environment of the compressor is decreased. Correspondingly, the force acting against the terminal is also decreased (since the pressure remains constant). A decreased force then enables the body of the hermetic terminal to be manufactured from a material having a thickness that is less than that of conventional terminals. Hence, the terminal body may be manufactured on smaller, less expensive tools that can run at higher production speed, thereby increasing manufacturing output.
Referring now to the drawings, and particularly to
A plurality of current-conducting pins 34 extend through corresponding ones of the plurality of openings 24 in the body member 12. Each conductor pin 34 includes an outer end 36 and an inner end 38, which may be fitted with a conventional electrical connection strap 40 or an electrical quick-connect tab 42, best seen in
The conductor pins 34 may manufactured from an electrically conductive metal material, such as solid copper or steel. Alternatively, a bimetallic, copper-core wire, having high electrical conductivity and possessing good hermetic bonding characteristics may also be utilized.
Each conductor pin 34 is sealed within its respective opening 24 of the body member 12 by a dielectric sealing material 44 that fills the opening 24 and hermetically bonds to both the body member 12 and the conductor pin 34. A suitable sealing material 44 is a sealing glass material that can be fused in the opening 24 and to both the body member 12 and the conductor pin 34. The sealing glass material 44 creates a non-conductive, glass-to-metal seal that is also an airtight hermetic seal between the conductor pin 34 and the body member 12 such that leakage through the hermetic terminal 10, by way of the conductor pin 34 and opening 24, is effectively prevented. Suitable sealing glass materials are well-known in the art.
A layer of a dielectric material forming an insulating member 46 is disposed over the exterior surface 22 of the body member 12 and lower portions 48 of the conductor pins 34 and is secured thereto by an insulating adhesive or the like. The insulating member 46 covers and helps protect the glass-to-metal seal and provides a dielectric over-surface covering for substantial portions of the outside surface 22 of the body member 12 and the conductor pins 34. The insulating member 46 can comprise silicone rubber.
Turning now to the hermetic terminals incorporating the pin-isolating feature 102, 202 of the present disclosure, exemplary embodiments of the disclosed device are illustrated in
With reference to
As illustrated, the pin-isolating feature 102 generally comprises an integrally formed body 104 made from an insulating, dielectric material. The body 104 of the pin-isolating feature 102 comprises a lower base portion 106 and an upper barrier portion 108. The base portion 106 is sized and shaped to closely fit the periphery of the exterior surface 22 of the bottom wall 14 of the body member 12 of the hermetic terminal 100. The base portion 106 includes an upper surface 110, a side wall 112 and an underside surface 114. The underside surface 114 of the base portion 106 is offset or separated from at least a portion of the exterior surface 22 of the terminal body member 12 and thereby creates an inner cavity portion 116 forming a gap or space between the base portion 106 and the exterior surface 22 of the terminal body member 12.
The pin-isolating feature 102 may comprise a moldable plastic resin material, such as polyphenyl sulfide. A suitable material is generally available under the tradename RYTON.
The base portion 106 of the pin-isolating feature 102 also includes a plurality of openings 118 that both correspond to and align with the plurality of openings 24 in the body member 12 of the hermetic terminal 100 and correspondingly receive the plurality of conductor pins 34 of the hermetic terminal 100. As shown in the enlarged detail view of
The upper barrier portion 108 of the pin-isolating feature 102 includes a central portion 128 and a plurality of generally vertically upstanding, planar ribs 130. The central portion 128 comprises a cylindrical member having a passageway 132 extending therethrough to the underside surface 114 of the base portion 106.
The plurality of generally vertically upstanding, planar ribs 130 extend from the upper surface 110 of the base portion 106 in a direction along a central longitudinal axis Z of the hermetic terminal 100 (which is generally parallel to the longitudinal axes of the conductor pins 34). As illustrated in
As shown in
Assembly of the pin-isolating feature 102 to the hermetic terminal 100 can be accomplished by securing it to the exterior surface 22 of the body member 12 of the hermetic terminal 100. In this regard, a dielectric injection molding material 138 is injection molded into the inner cavity portion 116. After the injection molding material 138 has cured, the pin-isolating feature 102 becomes bonded to the hermetic terminal 100. Optionally, a dielectric adhesive material 139 (such as an adhesion promoter or primer) can be applied to the exterior surface 22 of the body member 12 and/or the inner cavity portion 116 and/or the conductor pins 34 prior to injection molding to promote good adhesion between the injection molding material 138 and the body member 12 and/or the conductor pins 34 and/or the pin-isolating feature 102.
In one exemplary embodiment, portions of the body 104 of the pin-isolating feature 102 (e.g., the underside surface 114 and openings 118) and the exterior surface 22 of the bottom wall 14 of the hermetic terminal 100 can create a mold cavity for injecting the injection molding material 138 between the pin-isolating feature 102 and the hermetic terminal 100. For example, the pin-isolating feature 102 can first be placed on the hermetic terminal 100 such that the base portion 106 of the pin-isolating feature 102 covers the exterior surface 22 of the body member 12 of the hermetic terminal 100. As previously described, the inner cavity portion 116 is created and the inner cavity portion 116 can serve as a mold cavity for the injection molding material 138. The injection molding material 138 can then be injected into the mold cavity through the passageway 132 in the central portion 128 of the pin-isolating feature 102. The injection molding material 138 can flow to completely occupy the mold cavity, and excess injection molding material 138 can flow out through the openings 118 and passageway 132, if necessary. Once cured, the injection molding material 138 bonds to both the pin-isolating feature 102 and the hermetic terminal 100 (e.g., at both the exterior surface 22 of the body member 12 and the exterior surface of each of the conductor pins 34), securing the components together. The neck portions 120 and first shoulder portions 122 in the openings 118, and the passageway 132 through the central portion 128, assist in creating a suitably strong adhesive bond by increasing the surface area on the pin-isolating feature 102 over which the injection molding material 138 is exposed.
A suitable injection molding material for use with the invention of the disclosure is liquid silicone rubber (LSR). In addition, a dielectric adhesive primer material can also be used for promoting good adhesion between the injection molding material 138, the pin-isolating feature 102 and the terminal 100.
In addition to the adhesive bond that affixes the pin-isolating feature 102 to the hermetic terminal 100, the injection molding material 138 can also create a mechanical connection with features of the body 104 to further enhance the attachment of the pin-isolating feature 102 and the hermetic terminal 100. In this regard, and with reference to
Referring now to
As shown in the figure, the body 204 of the pin-isolating feature 202 comprises a lower base portion 206 and an upper barrier portion 208. The base portion 206 is sized and shaped to fit over the exterior surface 22 of the bottom wall 14 of the body member 12 of the hermetic terminal 200. In addition, the base portion can include collar portions 207 covering portions of the exposed surfaces of the conductor pins 34.
The barrier portion 208 comprises a plurality of generally vertically upstanding, planar ribs 230 that extend from the base portion 206 in a direction along a central longitudinal axis Z2 of the hermetic terminal 200 and generally parallel to the longitudinal axes of the conductor pins 34. As illustrated in
In this alternative embodiment, the pin-isolating feature 202 can be secured to the exterior surface 22 of the body member 12 and to the conductor pins 34 of the hermetic terminal 200 by a dielectric adhesive material 239 that is applied to the pin-isolating feature 202 (e.g., at the underside of the base portion 206) and/or the terminal 100 (e.g., on the exterior surface 22 of the body member 12 and/or the conductor pins 34) and provides good adhesion between the pin-isolating feature 202 and the terminal 100.
The pin-isolating feature 202 also provides a dielectric over-surface covering for substantial portions of the exterior surface 22 of the terminal body member 12 and the conductor pins 34 and covers and helps protect the glass seals 44.
Turning now to
Referring to
The central passageway 304 is sized and shaped to receive the outer ends 36 of the conductor pins 34, including the connecting straps 40 attached to the conductor pins 34, and the pin-isolating feature 102, 202 of the hermetic terminal 100, 200. Included in an outer periphery 312 of the central passageway 304 are alignment slots or guideways 314 that cooperatively engage with the ribs 130, 230 of the pin-isolating feature 102, 202 and appropriately orient the connector block 300 relative to the hermetic terminal 100, 200.
A first, inner channel 306 is generally centered in the body 302 and has a lead wire opening 314 at one end thereof for accommodating a lead wire (not shown). The first channel 306 includes an interior strap mounting surface 316 and opposing side walls 318, 320. Located on each side of the first channel 306 is a second, outer channel 308, 310, each second channel 308, 310 has an interior strap mounting surface 322. Bordering the outer periphery of each second channel 308, 310 is an outer wall 324 which, in cooperation with a corresponding side wall 318, 320 of the first channel 306, provides a lead wire opening 326 at one end of each second channel 308, 310 for accommodating a lead wire (not shown).
The interior strap mounting surfaces 316, 322 of the first and second channels 306, 308, 310 serve as mounting locations for the connecting straps 40 attached to the conductor pins 34 of the hermetic terminal 100, 200. As seen in
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Kolkman, Albertus Jan Hendrik, Schuckmann, Scott
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Aug 08 2012 | KOLKMAN, ALBERTUS JAN HENDRIK | Emerson Electric Co | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 028774 | /0499 | |
Aug 08 2012 | KOLKMAN, ALBERTUS JAN HENDRIK | Emerson Electric Co | CORRECTIVE ASSIGNMENT TO CORRECT THE MISSPELLING OF THE FIRST NAMED INVENTOR PREVIOUSLY RECORDED ON REEL 028774 FRAME 0499 ASSIGNOR S HEREBY CONFIRMS THE CORRECT SPELLING OF THE FIRST NAMED INVENTOR IS SCOTT SCHUCKMANN | 028801 | /0965 | |
Aug 10 2012 | Emerson Electric Co. | (assignment on the face of the patent) | / | |||
Aug 10 2012 | SHUCKMANN, SCOTT | Emerson Electric Co | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 028774 | /0499 | |
Aug 10 2012 | SCHUCKMANN, SCOTT | Emerson Electric Co | CORRECTIVE ASSIGNMENT TO CORRECT THE MISSPELLING OF THE FIRST NAMED INVENTOR PREVIOUSLY RECORDED ON REEL 028774 FRAME 0499 ASSIGNOR S HEREBY CONFIRMS THE CORRECT SPELLING OF THE FIRST NAMED INVENTOR IS SCOTT SCHUCKMANN | 028801 | /0965 | |
May 31 2022 | Therm-O-Disc, Incorporated | MORGAN STANLEY SENIOR FUNDING, INC | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 061521 | /0328 | |
Jan 30 2024 | Therm-O-Disc, Incorporated | TOKEN FINANCE HOLDINGS, LLC, AS COLLATERAL AGENT | FIRST LIEN PATENT SECURITY AGREEMENT | 066382 | /0576 |
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